I don't know if this video has been posted a dozen times or not. I really liked it. It's about 3 minutes and 20 seconds long. It's just a basic youtube video. Check it out if you hadn't seen it. This guy knew his stuff.
http://www.youtube.com/watch?v=ldsa4KbNZHE
http://www.youtube.com/watch?v=ldsa4KbNZHE